Flexible File Digital Voltmeter Card
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
The testing of flexible diskettes requires a repeatable way of determining, in one revolution, the average, maximum, and minimum differential peak-to-peak envelope voltage values of a constant frequency pattern written on any track. This need extends over a wide frequency and RPM range to cover new and existing products. The previous method, which was time consuming and not always repeatable, was to read the voltages from an oscilloscope screen and record them by hand. The digital voltmeter (DVM) card, shown in the figure, which is fast, accurate and repeatable, now allows the user to take the output bits from the card and display them or automatically record them in a computer data base.